3个不同株型玉米适宜密度的研究

Research on suitable plant density of maize with 3 different plant types

以当地3个不同类型的主栽玉米品种为试材，在7种不同种植密度条件下，研究了种植密度对3个玉米品种农艺性状和产量的影响。结果表明：随着种植密度的提高，穗长、穗粗、行数、行粒数、千粒重逐渐减小，秃尖长、株高和穗位高逐渐增加，生育期略有延长；平展型品种正大999的适宜种植密度为4．8万-5．4万株．／hm^2，半紧凑型品种正大619的适宜种植密度为5-4万株／hm^2，紧凑型品种玉美头105的适宜种植密度为5．4万-6．0万株／hm^2。

Three maize varieties with different plant types were used in seven different density treatments.Agronomic characteristics and yield were studied. The results showed that ear length,ear diameter, rows per ear, kernels per row, 1000-kernel weight reduced gradually with increasing the planting density,while barren ear tip, plant height and ear height increased gradually, and growth period extended slightly.Three maize varieties,viz,Zhengda 999 （fiat type maize）,Zhengda 619 （semi-compact type maize） and Yumeitou 105 （compact type maize） were concluded the appropriate density with 48000-54000, 54000 and 54000-60000 plants/hm2 planting density, respectively.